6a8o
From Proteopedia
Crystal structures of the serine protease domain of murine plasma kallikrein with peptide inhibitor mupain-1-16
Structural highlights
FunctionKLKB1_MOUSE The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin. Publication Abstract from PubMedSerine proteases play important roles in numerous physiological and pathophysiological processes. Moreover, serine proteases are classical subjects for studies of catalytic and inhibitory mechanisms of enzymes. Here, we determined the crystal structures of a serine protease, murine plasma kallikrein (mPK), and its complex with a peptidic inhibitor. Although mPK in the complex adopts a canonical protease structure, the apo-mPK exhibits a previously unobserved structural feature: the entrance of the intact S1 pocket is blocked by Glu217. In addition, molecular dynamics simulations and functional assays support the flexibility of Glu217 and suggest that this flexibility plays a role in regulating the activity of serine proteases. ENZYMES: EC: 3.4.21.34. Crystal structure of plasma kallikrein reveals the unusual flexibility of the S1 pocket triggered by Glu217.,Xu M, Chen Y, Xu P, Andreasen PA, Jiang L, Li J, Huang M FEBS Lett. 2018 Aug;592(15):2658-2667. doi: 10.1002/1873-3468.13191. Epub 2018, Jul 30. PMID:30019481[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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